Believe it or not, if you google "How to play I spy" you will come up with a variety of sites with game rules which you could easily cut and past, then print out as a tag to accompany the quilt. We play lots of variations beyond the usual color clue-- a spelling variant -- "Something that begins with Q" or "rhymes with" or "the animal that makes this sound__". It's a great game for building vocabulary, conversational skills (unless you play thumbs up/thumbs down variation), turn taking. Great idea for the fund raiser you're doing.